Hydrate formation and its effects on the thermal expansion properties of HfMgW3O12

2020 ◽  
Vol 22 (22) ◽  
pp. 12605-12612 ◽  
Author(s):  
Gaojie Zeng ◽  
Huanli Yuan ◽  
Juan Guo ◽  
Qiang Sun ◽  
Qilong Gao ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Hydrate Formation ◽  
Spectral Changes ◽  
Expansion Curve ◽  
Thermal Expansion Curve ◽  
Raman Spectral

The thermal expansion curve of HfMgW3O12 correlated with hydration/dehydration accompanying structure and Raman spectral changes.

Sintering Procedure of Calcium Hexaluminate Ceramics

2012 ◽  
Vol 468-471 ◽  
pp. 1022-1025
Author(s):  
Yuan Li
Keyword(s):  
Thermal Expansion ◽  
Intermediate Phase ◽  
Slip Casting ◽  
Ceramic Materials ◽  
Reaction Sintering ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior ◽  
Calcium Hexaluminate ◽  
Expansion Curve ◽  
Thermal Expansion Curve

Thermal expansion behavior of ceramic green bodies could be used to determine appropriate sintering procedure for ceramic materials. In this paper, green bodies containing alumina and calcium hydroxide was prepared by slip casting and their thermal expansion behavior was measured. Thermal expansion curve indicated that calcium aluminate (CaO•Al2O3, CA) and calcium dialuminate (CaO•2Al2O3, CA2) are yielded by reaction sintering as intermediate phase compounds in green samples at temperature about 1160°C and 1240°C-1410°C, respectively; and calcium hexaluminate (CaO•6Al2O3, CA6) is yielded as target product at 1450°C-1560°C. Controlled sintering procedure was determined according to thermal expansion curve of green samples. Analysis result to properties of sintered samples indicated that thermal expansion behavior revealed to be a very simple and powerful tool to determine reaction sintering procedure of calcium hexaluminate ceramics.

Raman spectral changes of PEDOT–PSS in polymer light-emitting diodes upon operation

2005 ◽  
Vol 412 (4-6) ◽  
pp. 395-398 ◽  
Author(s):  
Satoshi Sakamoto ◽  
Masanori Okumura ◽  
Zinggang Zhao ◽  
Yukio Furukawa
Keyword(s):  
Light Emitting Diodes ◽  
Light Emitting ◽  
Spectral Changes ◽  
Polymer Light Emitting Diodes ◽  
Raman Spectral

Raman spectral changes of Artemisinin-induced Raji cells apoptosis

2015 ◽  
Vol 81 ◽  
pp. 83-89 ◽  
Author(s):  
Shufang Hu ◽  
Yanyan Feng ◽  
Daosen Zhang ◽  
Xiaoxu Lu ◽  
Jindong Tian ◽  
...  
Keyword(s):  
Raji Cells ◽  
Spectral Changes ◽  
Raman Spectral

scholarly journals The thermal expansion of bismuth by X-ray measurements

1934 ◽  
Vol 143 (849) ◽  
pp. 465-472 ◽  
Keyword(s):  
Thermal Expansion ◽  
Melting Point ◽  
Single Crystals ◽  
Room Temperature ◽  
The Other ◽  
Optical Methods ◽  
Lattice Expansion ◽  
X Ray ◽  
Expansion Curve ◽  
Methods Of Measurement

X-ray measurements recently carried out by the author on the lattice expansion of silver and quartz showed that the coefficients of thermal expansion, over the ranges investigated, are the same as those observed for the specimen as a whole using optical methods. Goetz and Hergenrother, on the other hand, from X-ray measurements on the coefficients of thermal expansion of single crystals of bismuth, claimed to have found a large difference between values obtained by the two methods of measurement. A possible explanatiion of this that their accuracy is not sufficient to establish definitely the deviation of the X-ray measurements from the optical expansion curve. The author has since made X-ray measurements on the expansion of the bismuth lattice from room temperature to just below the melting point, and finds no evidence of such a discrepancy as Goetz and Hergenrother record.

Raman spectral changes of neat CO2 across the ridge of density fluctuation in supercritical region

2000 ◽  
Vol 320 (3-4) ◽  
pp. 323-327 ◽  
Author(s):  
Hideyuki Nakayama ◽  
Ken-ichi Saitow ◽  
Maki Sakashita ◽  
Kikujiro Ishii ◽  
Keiko Nishikawa
Keyword(s):  
Density Fluctuation ◽  
Supercritical Region ◽  
Spectral Changes ◽  
Raman Spectral

Pressure- and temperature-induced Raman spectral changes of 1-butyl-3-methylimidazolium tetrafluoroborate

2011 ◽  
Vol 31 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Yusuke Imai ◽  
Takahiro Takekiyo ◽  
Hiroshi Abe ◽  
Yukihiro Yoshimura
Keyword(s):  
Spectral Changes ◽  
Raman Spectral

Vibrational Spectroscopic Study of Iodine-Doped Poly(Isothianaphthene)

2002 ◽  
Vol 56 (7) ◽  
pp. 909-915 ◽  
Author(s):  
Wei-Te Chen ◽  
Graham A. Bowmaker ◽  
John M. Seakins ◽  
Ralph P. Cooney
Keyword(s):  
Raman Spectroscopy ◽  
Laser Excitation ◽  
Far Infrared ◽  
Mid Infrared ◽  
Spectral Changes ◽  
Infrared And Raman Spectroscopy ◽  
Doped Polymer ◽  
Raman Spectral ◽  
Ir And Raman ◽  
Absorption Mode

Far-infrared, mid-infrared, and Raman spectroscopy were used to characterize iodine-doped poly(isothianaphthene) (PITN) films and powders. The far-infrared and mid-infrared results show changes from absorption mode to reflective mode as the doping level increases, consistent with the iodine-doped PITN becoming more metallic and more conductive at higher doping levels. The far-IR and Raman (514.5-nm laser excitation) results show that I3− is dominant in iodine-doped PITN. The Raman spectral changes observed using 1064-nm excitation are different from those measured using 514.5-nm excitation. The spectra recorded with 514.5-nm excitation show features due to the undoped parts of the polymer, and these indicate that the effective conjugated chain length decreases with increased doping. The Raman spectra obtained by using 1064-nm excitation show features due to polaron and bipolaron states in the doped polymer.

Raman microprobe study of nanophase TiO2 and oxidation-induced spectral changes

1990 ◽  
Vol 5 (6) ◽  
pp. 1246-1252 ◽  
Author(s):  
J. C. Parker ◽  
R. W. Siegel
Keyword(s):  
Raman Spectra ◽  
Oxygen Deficiency ◽  
Spatial Inhomogeneity ◽  
Spectral Changes ◽  
Raman Microprobe ◽  
Phase Inhomogeneity ◽  
Quantitative Indicators ◽  
Raman Spectral ◽  
Line Positions

A Raman microprobe study of as-compacted nanophase TiO2 was carried out to investigate the spatial inhomogeneity of its anatase and rutile phases. Also, changes in the observed Raman spectra (line shifts and broadening) were investigated as a function of annealing at temperatures up to 600°C in argon or air. Microscopic phase inhomogeneity is observed and Raman spectral changes are shown to result from inhomogeneous oxygen deficiency in the nanophase TiO2. The line positions corresponding to the Raman active Eg modes in both anatase and rutile are found to be sensitive to this oxygen deficiency and are potential quantitative indicators of such deviations from stoichiometry.

scholarly journals Raman Spectral Changes of Sugi Bark during Thermal Degradation and Carbonization

2000 ◽  
Vol 49 (9Appendix) ◽  
pp. 227-228
Author(s):  
Shigeru YAMAUCHI ◽  
Yoshinari KIKUCHI ◽  
Yasuji KURIMOTO
Keyword(s):  
Thermal Degradation ◽  
Spectral Changes ◽  
Raman Spectral
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